Hysteretic magnetoresistance and unconventional anomalous Hall effect in the frustrated magnet TmB4

Date
2016-05-01
Authors
Sunku, Sai
Kong, Tai
Ito, Toshimitsu
Canfield, Paul
Shastry, B. Sriram
Sengupta, Pinaki
Panagopoulos, Christos
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Ames Laboratory
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Physics and Astronomy
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Abstract

We study TmB4, a frustrated magnet on the Archimedean Shastry-Sutherland lattice, through magnetization and transport experiments. The lack of anisotropy in resistivity shows that TmB4 is an electronically three-dimensional system. The magnetoresistance (MR) is hysteretic at low temperature even though a corresponding hysteresis in magnetization is absent. The Hall resistivity shows unconventional anomalous Hall effect (AHE) and is linear above saturation despite a large MR. We propose that complex structures at magnetic domain walls may be responsible for the hysteretic MR and may also lead to the AHE.

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This article is published as Sunku, Sai Swaroop, Tai Kong, Toshimitsu Ito, Paul C. Canfield, B. Sriram Shastry, Pinaki Sengupta, and Christos Panagopoulos. "Hysteretic magnetoresistance and unconventional anomalous Hall effect in the frustrated magnet TmB 4." Physical Review B 93, no. 17 (2016): 174408. DOI: 10.1103/PhysRevB.93.174408. Posted with permission.

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